Jesús Villagrasa has informed me about the availability of a PDF file containing his complete “Bibliografia sulla metafisica di Tommaso d’Aquino.” The page on which this PDF can be found is here, and the direct link to the PDF is here (1.12 Mb).
Mark Johnson is an associate professor of Theology at Marquette University, and founded thomistica.net on Squarespace in November of 2004. He studied with James Weisheipl, Leonard Boyle, Walter Principe, and Lawrence Dewan, at the Pontifical Institute of Mediaeval Studies (Toronto, Canada).